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 Hansell's XXI Bomber Command, the combat arm of the Washington- based Twentieth Air Force. Iwo Jima, conquered after heavy fighting in February 1945, provided an emergency landing field for damaged B-29s and a base for P-51 fighter escorts. After a largely futile strategic bombing effort from India and China in 1944, XX Bomber Command joined Hansell's growing force in the Marianas early in 1945 for the final strikes against Japan.

Hansell, an author of AWPD/I, stayed true to high-altitude daylight precision strategic bombing doctrine, beginning with XXI Bomber Command's first mission against the Japanese home islands on November 24, 1944. His assignment was to "achieve the earliest possible progressive dislocation of the Japanese military, industrial, and economic systems and to undermine the morale of the Japanese people to a point where their capacity and will to wage war was decisively weakened." He faced technical problems (including B-29 engines that tended to burst into flames), unanticipated 200 mile-per-hour winds of the jet stream over the home islands, and bad weather when striking mainly at Japan's aviation industries. At high altitude bombing accuracy was minimal; only 10 percent of bombs dropped fell within 1,000 feet of a target. Twenty-two missions disabled only one factory.

Arnold replaced Hansell with Major General Curtis LeMay in January 1945, with orders to achieve immediate results. During January and February 1945, LeMay's results were no better than Hansell's. He then surmised that Japanese industry was too dispersed and bombing accuracy too poor for a precision campaign from high altitude in daylight. Recognizing that Japanese air defenses were far weaker than those he had encountered in Germany, but still taking a great gamble to produce immediate results, he ordered his crews to remove their defensive guns and fly low (at seven thousand feet) by night to carry heavier bomb loads, and burn down Japan's cities with incendiaries. The initial raid against Tokyo on March 10, 1945, burned 15.8 square miles of urban area, killed almost 85,000, wounded almost 45,000, made almost 1 million homeless, and became the most deadly air attack in history. By August LeMay's air force had burned 150 square miles in 68 Japanese cities―few of significant size remained undamaged. Faced with an implacable enemy unwilling to surrender and the prospect of a costly invasion, but equipped with a new weapon of tremendous destructive capability, President Harry Truman ordered the first atomic bomb dropped on Hiroshima on August 6 and a second on Nagasaki three days later. Japan surrendered on August 14 after strategic bombing had levelled all of its major cities and killed or injured 800,000 of its people. 38